FORM 150.63-EG1

TABLE 5 – REFRIGERANT LINE PRESSURE DROPS (METRIC)

 

 

 

 

 

SUCTION LINE

 

 

LIQUID LINE

 

MODEL

SYSTEM

1NOMINAL

COPPER

2PRESSURE

VELOCITY

4NOMINAL

COPPER

3PRESSURE

NUMBER

NUMBER

KW

TYPE L

DROP

@NOMINAL

KW

TYPE L

DROP

YCUL

 

 

CAPACITY

 

 

 

INCHES O.D.

kPa/30.5 m

IN M/S

UNLOADED

INCHES O.D.

kPa/30.5 m

 

 

 

 

 

 

 

 

 

 

1

158

 

2-1/8

33.8

20.6

53

1-1/8

30.3

0090

52-5/8

11.7

13.7

1-3/8

11.7

 

 

 

2

158

 

2-1/8

33.8

20.6

53

1-1/8

30.3

 

 

 

52-5/8

11.7

13.8

1-3/8

11.7

 

 

 

 

 

1

175.7

2 5/8

14.5

914

 

1 1/8

37.2

0096

3 1/8

6.2

671

87.9

1 3/8

14.5

 

 

2

144.1

2 1/8

28.3

1125

1 1/8

25.5

 

 

 

2 5/8

9.7

750

 

1 3/8

9.7

 

 

 

 

 

1

172.2

2 5/8

13.8

896

 

1 1/8

35.9

0100

3 1/8

6.2

657

87.9

1 3/8

13.8

 

 

2

172.2

2 5/8

13.8

896

1 1/8

35.9

 

 

 

3 1/8

6.2

657

 

1 3/8

13.8

 

 

 

 

 

1

207.4

2 5/8

19.3

1079

 

1 1/8

50.3

0106

 

3 18

8.3

791

70.3

1 3/8

19.3

 

 

 

2

175.7

2 5/8

14.5

914

1 1/8

37.2

 

 

 

5

3 1/8

6.2

671

 

1 3/8

14.5

 

 

 

 

 

1

214.4

2 5/8

20.7

1116

 

1 1/8

53.8

0120

5

3 1/8

9.0

818

70.3

1 3/8

20.7

 

 

2

214.4

2 5/8

20.7

1116

1 1/8

53.8

 

 

 

5

3 1/8

9.0

818

 

1 3/8

20.7

 

 

 

 

 

1

260.1

2 5/8

29.6

1353

 

1 3/8

29.6

0130

3 1/8

13.1

992

87.9

1 5/8

11.0

 

 

2

210.9

2 5/8

20.0

1097

1 1/8

52.4

 

 

 

3 1/8

9.0

805

 

1 38

20.0

 

 

 

 

REFRIGERANT PIPING NOTES

1.Based on R-22 at the nominal capacity of the unit or system, an ambient temperature of 95°F (35°C) and a suction temperature of 45°F (7.2°C).

2.Suction line sizes were calculated based on a nominal maximum pressure drop to 3 PSI/100 ft. (20.7 kPa/30.5 m). When calculating suction line pressure drop for a specific application, it should be noted that system capacity decreases as suction line pressure drop increases.

3.Liquid pressure drop (or gain) due to a vertical liquid line is not included in the tables and must be taken into account when determining pres- sure drop (or gain) of the liquid line. The nominal value that must be included in the liquid line loss (or gain) is .5 PSI/foot (3.4 kPa/30 cm) of rise (or gain). To ensure a solid column of liquid refrigerant to the expansion valve, the total maximum pressure drop of the liquid line should not exceed 40 PSI (276 kPa) based on 15°F (8.3°C) subcooled liquid. Vapor in the liquid line, even in small amounts, will measurably reduce valve capacity and poor system performance will result. In addition, pressure loss for strainers, filter driers, solenoid valves, and isolation valve or fittings are not included in this table, and must be taken into account.

4.Nominal Tons (KW) Unloaded is based on one compressor (per system) operating at design conditions.

5.Based on minimum compressor staging for the given pipe size, a double suction riser should be used to ensure proper oil return to the com- pressor on all vertical suction risers. Oil returning up the riser moves up the inner surface of the pipe and depends on the mass velocity of the refrigerant vapor at the wall surface to move the oil up the vertical rise.

6.Hot gas bypass lines are typically 7/8" for lines up to 40 feet and 1-1/8" for lines over 40 feet in length (12 meters). The field connections sizes are 7/8" for the optional factory mounted hot gas bypass valve. Note: Hot gas bypass is only available for refrigerant system number 1.

7.For more information, please refer to either the York DX Piping Guide (form 050.40-ES2) or the ASHRAE Refrigertion Handbook.

YORK INTERNATIONAL

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York YCUL0016, YCUL0130 manual Liquid Line Model System 1NOMINAL Copper, Number Type L Drop @NOMINAL Ycul Capacity